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Appendix VIt

1163

the quantity of mixture by an actual cut off of the supply, as in
steam engines. The half-speed cam shaft A acts upon the levers
s s to lift the exhaust valve R, and the exhaust pipe Q is water-

cooled, as well as tibe valve itseli. The valve E admits air during
the scavenging stroke. Gas eaters through P and L, and air by
N and M to the inlet valve L. The shaft A drives a secondary

A G